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Separate Account Balances - Benefits and Protection (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Changes in separate account liabilities |  |
Balance at beginning of period | $ 167,605.6 |
Balance at end of period | 173,327.1 | $ 167,605.6
Benefits and Protection | Life Insurance | Universal life |  |
Changes in separate account liabilities |  |
Balance at beginning of period | 5,982.5 | 5,011.0
Premiums and deposits | 557.2 | 532.1
Policy charges | (132.7) | (129.0)
Surrenders, withdrawals and benefit payments | (492.2) | (342.1)
Investment performance | 880.5 | 902.8
Net transfers (to) from general account | 11.4 | 7.7
Balance at end of period | 6,806.7 | 5,982.5
Cash surrender value | $ 6,869.5 | $ 6,041.9

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